I keep trying to find out when R&S disappeared. The last patent I could find which is assigned to them is 1,478,085, filed in 1922. There is mention of them in a 1926 issue of Architecture and Building, and as late as 1929 in banking directories but perhaps the publisher didn't realize they were no longer in business so that's not terribly definitive. Philadelphia telephone directories and/or city directories might help but I don't believe any are online (are there any Philadephians in the group?). Aside from Google and Google Books, are there any suggestions for further searching?